    <link rel="stylesheet" href="./demo.css">
    <div class="box box1">
        <img src="./imgs/img1.jpg" alt="">
        <ul>
            <li class="active"></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </ul>
    </div>
    <br>
    <div class="box box2">
            <img src="./imgs/img1.jpg" alt="">
            <ul>
                <li class="active"></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
            </ul>
        </div>

<script src="./demo.js"></script>
 <script>
         let obj = new Lbt('.box1')
         let boj2 = new Lbt('.box2')
 </script>